阅读下面这首诗,回答问题。
早秋三首(其一)
[唐]许 浑
遥夜泛清瑟,西风生翠萝。
残萤栖玉露,早雁拂金河。
高树晓还密,远山晴更多。
淮南一叶下,自觉洞庭波。
诗人在前两联里描绘了一幅怎样的景象图,请简要分析。
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前人认为此诗颈联不仅“景真,尤在理足”,请结合诗歌情感的变化谈谈你的看法。
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